Debug mode

Insert the Sonic The Hedgehog 2 cartridge into the Sonic And Knuckles cartridge. Play songs 1, 9, 9, 4, 1, 0, 1, 8 in order at the level selection screen. Then, select any level, hold A, and press Start. Screen coordinates will appear instead of a score and the number of objects displayed will appear instead of the time remaining. Use one of the following controller actions to enable the corresponding debug code. Note: This code may only be enabled on the first version of the game.

Alternately, insert the Sonic The Hedgehog 3 cartridge into the Sonic And Knuckles cartridge. First, enable the "Sound Test" option by grabbing hold of a vine in Angel Island. While swinging, press Left(3), Right(3), Up 3). A ring sound will confirm correct code entry. Next, grab any pulley in Mushroom Hill and press Left(3), Right(3), Up(3). The ring sound will confirm correct code entry. Pause game play and press Start. You will be taken to the Sega logo and title screen. Select either the "Sound Test" or "1 player" options. When selecting the level, hold A and press Start.

Alternately, insert the Sonic The Hedgehog 3 cartridge into the Sonic And Knuckles cartridge. Enable the "Debug mode" code and complete the entire Sonic The Hedgehog 3 game. Because it is connected to Sonic and Knuckles, you should go straight from Launch Base to Mushroom Hill and be able to cheat until the end.

Alternately, insert the Sonic The Hedgehog 3 cartridge into the Sonic And Knuckles cartridge. Enable the "Level select" code and go to Mushroom Hill Zone Act I. Hold A the enter time that you are there. Press B to jump. When you reach the first Pull Up machine, press Left(3), Right(3), Up(3). A sound will confirm correct code entry. Return to the level select screen, choose a level, then hold A and press Start.

Object transformation
Press B during game play to change Sonic into a game object. Press A to change into a new object. Press C to place an object on the screen. Press B again to revert back to Sonic. Note: The type of object that may be selectable will vary from level to level.

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